Crest Audio X-Four Owner's Manual
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Crest Audio X-Four Owner's Manual

X series
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X-Four mixing console

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Summary of Contents for Crest Audio X-Four

  • Page 1 X-Four mixing console...

  • Page 2: Block Diagram

    X-Four owner’s manual...
  • Page 3 table of contents mono inputs stereo inputs p. 25 group master power supply p. 7 p. 41 p. 57 p. 81...
  • Page 4 X-Four owner’s manual...

  • Page 5: How To Use This Manual

    X-Four console will appear as: TERMS tasks are broken down into steps warnings Procedures not to attempt. Issues or hazards to keep in mind when operating the equipment. indicators ® What to look for on-screen.

  • Page 6: Mono Input Module

    X-Four owner’s manual panel module block diagram legend p. 6...
  • Page 7 features phantom power—+48 48 volts DC is applied to pins 2 and 3 on the mic-input XLR con- nector. This option is used with condenser microphones and active direct boxes that require an external DC voltage (phantom power) in order to operate.
  • Page 8 X-Four owner’s manual panel module block diagram legend p. 8...
  • Page 9 features gain The Input gain control range is closely related to the status of the switch and the switch. In order to establish proper gain structure in LINE the console, input gain settings must be set correctly. —switch-up LINE 15 to 75dB of gain can be added the mic-input signal. The impedance at the input XLR is 4kΩ.
  • Page 10 X-Four owner’s manual panel module block diagram legend p. 10...
  • Page 11 EQ features Many audio signals coming into the console require some degree of cor- rective eq in order to be part of a good sounding mix. The input eq consists of four-bands: high, high-mid, low-mid and low. The high and low bands have fixed frequencies while the high-mid and low- mid bands are sweepable, with their higher and lower frequencies over- lapping adjacent bands.
  • Page 12 X-Four owner’s manual panel module block diagram p. 12...
  • Page 13 aux send features Six auxiliary are available for creating individual output mixes. AUX SENDS These mixes can be used for driving effects processors, providing monitor mixes, creating broadcast or alternate sound reinforcement mixes, or other special requirements. aux sends 1–6 These knobs adjust the amount of signal sent to the Unity gain occurs at the zero setting.
  • Page 14 X-Four owner’s manual panel module block diagram p. 14...
  • Page 15 bus assignment features The Input bus assignment section offers considerable flexibility for creat- ing what eventually becomes the main output mix. Such features as and eight-individual group assignments allow several GROUP PAN ON approaches to building the desired mix.All assignments are derived post- fader, post-eq, and post-mute.
  • Page 16 X-Four owner’s manual panel module block diagram p. 16...
  • Page 17 mono input module bus assignment features mute The Mute switch mutes the channel as well as both pre- and post- fader AUX SENDS write-in label This label may be written on with a grease-marker, and later wiped clean with a cloth moistened with isopropyl/rubbing alcohol. Masking tape may also be placed on this surface, if desired.
  • Page 18 X-Four owner’s manual panel module block diagram p. 18...
  • Page 19 level meter features level meter Each input includes a five-segment LED meter for visually monitoring signal levels.This is essential for setting up and main- taining proper gain structure. peak indicator—PK The input signal is monitored at several points throughout the chan- nel.These points are the mic preamp, the EQ stage and the fader stage.
  • Page 20 X-Four owner’s manual panel module block diagram p. 20...
  • Page 21 bus assignment features mono assignment—M The signal is assigned to the discrete mono bus. When the button is depressed, this switch is bypassed. left / right assignment—L-R The Group signal is assigned to the main Left and Right output buses, deriving its signal after the channels pan system.When the LCR button is depressed, this switch is bypassed.
  • Page 22 X-Four owner’s manual panel module block diagram p. 22...

  • Page 23: Rear Panel Features

    rear panel features direct out 1/4" TRS jack The input channel's signal is available at this output jack.The default signal routing is derived post-fader, post-eq and post-mute.This output jack is ground-compensated. insert points Separate 1/4" TRS jacks provide the facilities for inserting an external sig- nal processor into the signal path of the input channel.

  • Page 24: Stereo Input Module

    X-Four owner’s manual panel module block diagram legend p. 24...
  • Page 25 features The stereo input module can be configured to operate as either stereo or mono.When configured to operate in mono, many features are identical to those of the mono input module. line select—Line 2 This switch determines selection of input signals from the three sets of rear panel connectors.
  • Page 26 X-Four owner’s manual panel module block diagram legend p. 26...
  • Page 27 features input gain— GAIN This control adjust the gain of the input preamp(s). Both left and right input signals are affected by this control. polarity reverse—ø This switch inverts the polarity of the right input signal in relation to the left input signal.
  • Page 28 X-Four owner’s manual panel module block diagram legend p. 28...
  • Page 29 four-band stereo EQ features Although left and right signals are processed separately,the parameters are set in tandem by common front-panel controls. see—mono input module high frequency—HF 15dB boost and cut at 12kHz—shelving response. high-mid frequency—HM 15dB boost and cut. Selectable frequency range of 400Hz to 8 kHz. The response is bell-shaped with a fixed Q of 1.5 low-mid frequency—LM 15dB boost and cut.
  • Page 30 X-Four owner’s manual panel module block diagram p. 30...
  • Page 31 aux send features The following descriptions apply to the stereo line input module when configured for stereo operation. see—mono input module for mono operation aux send 1–6 controls These knobs adjust the amount of signal sent the 1–4 are fed from a summed-mono source. A from this mono source, but can be switched to stereo operation.
  • Page 32 X-Four owner’s manual panel module block diagram p. 32...
  • Page 33 stereo input module bus assignment features balance control The Balance control adjusts the Stereo balance for Left/Right and the Group Assignment section when in Balance mode. When the Stereo Line Input module is being used as a Mono input, the Balance control functions as a Pan control.
  • Page 34 X-Four owner’s manual panel module block diagram p. 34...
  • Page 35 bus assignment features peak indicator—PK The input signal is monitored at several points throughout the chan- nel.These points are the mic preamp, the EQ stage and the fader stage. Overloads at any of these stages will cause the red peak- LED to light. Then the channel gain should reduced.
  • Page 36 X-Four owner’s manual panel module block diagram p. 36...
  • Page 37 bus assignment features balance on—groups— BAL ON The left and right signals are summed as mono to make up the group assignment signals. The left and right signals are assigned in stereo to the groups in odd/even pairs. assignment switches 1 and 3 carry the left input-sig- GROUP nal and assignment switches 2 and 4 carry the right input-signal.
  • Page 38 X-Four owner’s manual panel module block diagram p. 38...
  • Page 39 stereo input module rear panel features The stereo line-input module provides connectors for three stereo line- level signals. see—line 2 switch. balanced left and right line-in XLR connectors These two jacks accept balanced or unbalanced +4dB line level signals.The switch on front-panel must be disengaged for these connectors to LINE be active.

  • Page 40: Group Module

    X-Four owner’s manual panel module block diagram p. 40...
  • Page 41 The X-Four output-section includes eight output-equalizers occupying the upper portions of the four GROUP modules. By using designated assignment switches, output eq’s can be fed by the six , the two matrix masters or left, right, and mono masters.
  • Page 42 X-Four owner’s manual panel module block diagram p. 42...
  • Page 43 output EQ features equalizer—EQ ON Equalizer is on.This switch can be used to make A/B comparisons between "flat" and eq'd signals. group equalization —per output channel— This switch selects the signal path for the eq. eq to AUX MASTERS eq to GROUPS group module EQ TO GROUP...
  • Page 44 X-Four owner’s manual panel module block diagram legend p. 44...
  • Page 45 The X-Four includes two MATRIX made up of signals from the four and an external source. matrix 1–2 levels—M1, M2 These level controls are used to mix the group's signal into the cor- responding matrix. post-group fader setting has no effect on the group-to-matrix level GROUP controls 1–2.
  • Page 46 X-Four owner’s manual panel module block diagram legend p. 46...
  • Page 47 fader reverse feature is used to swap the functions of the trols and the controls and the GROUP MASTER controls. MAIN Swapped controls include: the switch, and the control (via rotary control on the MASTER LEVEL and a fader on the GROUP MASTER reversing aux / group and aux / main AUX—red LED off...
  • Page 48 X-Four owner’s manual panel module block diagram legend p. 48...
  • Page 49 group assignment features mono assignment—from group— signal is assigned to the discrete mono bus. GROUP left/right assignment—from group— L/R signal is assigned to the main left and right output buses. GROUP pot is used to position the group signal within the stereo left / right field.The signal must be assigned to left and right in order for the control to have any effect.
  • Page 50 X-Four owner’s manual panel module block diagram p. 50...
  • Page 51 group aux level features signal/peak LED ’s This dual color LED responds to the pre-fader signal. It illuminates green with varying brightness in proportion to the audio signal.When the signal approaches clipping, the LED illuminates red. talk to—fader 1–4 This switch adds the TALKBACK level of the signal is set by the...
  • Page 52 X-Four owner’s manual panel module block diagram p. 52...
  • Page 53 rear panel features group output This balanced male XLR connector carries the see—group fader, front-panel description group insert point Separate 1/4" TRS jacks provide the ability to insert an external signal processor into the signal path of the group insert send This output connects to the input of an external signal proces- sor.
  • Page 54 X-Four owner’s manual panel module block diagram lamp dim switch and DC IN connector p. 54...
  • Page 55 rear panel features auxiliary 1–6 output XLR’s This balanced male XLR connector carries the These outputs are controlled by their respective see—aux section, front panel description aux insert point Separate 1/4" TRS jacks provide the ability to insert an external signal processor into the signal path of the aux insert send This output connects to the input of an external signal proces-...

  • Page 56: Master Module

    X-Four owner’s manual module block diagram panel p. 56...
  • Page 57 output EQ features On the module block, the default sources for the four output eq’s MASTER are the MATRIX By using designated assignment switches, source for the first three output eq’s can be switched over to the left, right and mono masters.The fourth eq is always fed by master.
  • Page 58 X-Four owner’s manual module block diagram panel p. 58...
  • Page 59 output EQ features equalizer— EQ ON Equalizer is on. This switch can be used to make A/B comparisons between flat and eq’d signals. left, right, mono equalization— These three switches select the signals fed to each of the first three eq’s on the first three master sub-modules.The fourth does not include a switch because its source is always are fed to the first two eq’s.
  • Page 60 X-Four owner’s manual module block diagram panel p. 60...
  • Page 61 The X-Four includes two MATRIX up of signals from the four GROUPS left, right, and mono levels— These level controls are used to mix the left, right, and mono signals into the corresponding MATRIX post-fader—left, right, and mono...
  • Page 62 X-Four owner’s manual block diagram module panel p. 62...
  • Page 63 matrix output features master output levels —MTX 1–2 These are the output level controls for the MASTER They control the levels that appear at the corresponding connectors on the rear-panel. matrix 1–2 talkback— TALK TO This switch adds the TALKBACK The level of the signal is set by the TALKBACK...
  • Page 64 X-Four owner’s manual module block diagram panel p. 64...
  • Page 65 alternate out features output section allows assignment of the left and right ALTERNATE signals (plus center—if OUTPUTS anced male XLR connectors on the rear-panel. By utilizing the mode switches located below the signals can be derived in a number of ways. In default mode (no switches depressed), the post-fader left and right ed through the level control and appear at the...
  • Page 66 X-Four owner’s manual block diagram module panel p. 66...
  • Page 67 monitor output features output section controls the audio feed for the console oper- MONITOR ator. Features are similar to those of section is normally used to access the ITOR outputs. Like the alternate output section, it provides the ability to assign the left and right signals to a designated pair of balanced male XLR con- MASTER...
  • Page 68 X-Four owner’s manual block diagram module panel p. 68...
  • Page 69 left master features signal/peak LED—SIG/PEAK This dual-color LED responds to the left pre-fader signal. It illuminates green with varying brightness in proportion to the audio signal.When the signal approaches clipping,either pre- or post-fader,the LED illuminates red. talkback left/right —TALK TO system output is added to the left and right TALKBACK outputs.The level of the...
  • Page 70 X-Four owner’s manual block diagram module panel p. 70...
  • Page 71 right master features signal/peak LED—SIG/PEAK This dual-color LED responds to the right pre-fader stereo signal. It illuminates green with varying brightness in proportion to the audio signal. When the signal approaches clipping, either pre- or post-fader, the LED illuminates red. right —TALK TO system output is added to the left and right...
  • Page 72 X-Four owner’s manual block diagram module panel p. 72...
  • Page 73 mono master features signal/peak LED—SIG/PEAK This dual-color LED responds to the pre-fader mono signal. It illumi- nates green with varying brightness in proportion to the audio signal. When the signal approaches clipping, either pre- or post-fader, the LED illuminates red. talkback mono —TALK TO MONO system output is added to the mono...
  • Page 74 X-Four owner’s manual module block diagram panel p. 74...
  • Page 75 talkback features system provides facilities for assigning an external signal TALKBACK (usually the console operator's microphone) to any of the console's out- puts.Other signals can be routed through the tone oscillator or the built in PINK NOISE talkback level This control sets the level that appears at any of the outputs with their respective switches engaged.
  • Page 76 X-Four owner’s manual block diagram module panel p. 76...
  • Page 77 rear panel features left and right alternate output XLR ’s This pair of balanced male XLR connectors carries the left and right signals.These outputs are controlled by the ALT OUT see—left and right alternate output, front-panel description left and right monitor output jacks This pair of ground compensated 1/4"...
  • Page 78 X-Four owner’s manual block diagram module panel p. 78...
  • Page 79 rear panel features insert points—left, right, and mono Separate 1/4" TRS jacks provide the ability to insert external signal proces- sor into the signal paths of the left, right and mono insert sends—left, right, and mono These jacks connect to the input of signal processors.The sig- nals are derived after the left, right and mono summing amplifiers.

  • Page 80: Power Supply

    A DC A DC connectors on rear JR16RK-7S JIS C 5432 standard olts, degrees 16PK-7S and -7P connectors fitted 4.5 amps maximum input voltage. No changes needed inch rack mount unit inches wide, inches deep. pounds X-Four owner’s manual master rear-panel...
  • Page 81 The X-Four power supplies have certain electrical requirements for proper operation. If possible the power supply should be connected to a dedicated circuit. Should any other appliance on the same circuit draw enough current to overload the circuit, the breaker or fuse will trip causing loss of power to the console.

  • Page 82: Specifications

    A DC A DC connectors on rear JR16RK-7S JIS C 5432 standard olts, degrees 16PK-7S and -7P connectors fitted 4.5 amps maximum input voltage. No changes needed inch rack mount unit inches wide, inches deep. pounds X-Four owner’s manual master rear-panel...
  • Page 83 power supply usage console and power supply grounding Console chassis ground is electrically connected to: the audio ground, pin- 1 of XLR connectors, the sleeves of 1/4” sockets,and to the terminal at the rear of the power supply. SOLE GROUND The AC third-wire connection in the power supply cable connects the metal chassis of the power supply to safety ground.
  • Page 84 v. 1.0 D7000011...

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